Characteristics of micro-texture and meso-texture in (Bi, Pb)2Sr2Ca2Cu3O10 superconducting tapes

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Grain boundary misorientation is known to limit the critical current density of bulk high temperature superconductors. However, the effect of mechanical deformation on the texture evolution during powder-in-tube (PIT) processing remains unclear, especially on the microstructural level. In the present work, the micro- and meso-texture characteristics of PIT-processed (Bi, Pb)2Sr2Ca2Cu3O10 (Bi2223) superconductor tapes were investigated. The results for micro-texture show that [iopmath latex="$a/b$"] a/b [/iopmath] -axes texture does exist in PIT-processed tapes. From the meso-texture studies, it was found that a majority of the grain boundaries were formed by grains with a non-parallel c-axis. These grain boundaries generally have low mismatch angles of up to [iopmath latex="${\sim}10^\circ$"] ~10° [/iopmath] . High-angle misorientation boundaries ranging up to [iopmath latex="$45^\circ$"] 45° [/iopmath] are generally c-axis twist boundaries. Furthermore, about 40% of the grain boundaries could be coupled strongly.

Document Type: Miscellaneous

Affiliations: 1: School of Materials Engineering, Nanyang Technological University, Singapore 2: Department of Chemical and Materials Engineering, The University of Auckland, New Zealand 3: Institute of Superconducting and Electronic Materials, The University of Wollongong, Australia

Publication date: January 1, 2001

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